P2432: AIR System Air Flow/Pressure Sensor Circuit Low (Bank 1)

P2432 means the bank 1 secondary air pressure signal has fallen below its valid band – typically a broken signal lead, a ground short or a missing 5 V reference. GM's tables give the limit as under 5 % of the reference (400 failed samples out of 1,000 on the 2005 3.8L V6) and, from 2018, under 6 % for 800 of 1,000 samples; the check runs all the time and is rated Type B. Volkswagen flags the code below 0.40 V on 2014 Beetle and Golf CBFA engines and below 0.5 V on the 2.5L five-cylinder. Because a dead signal makes every flow and valve test meaningless, those tests are suspended while the code is stored. The high-side twin is P2433, bank 2 uses P2437. Drivability is not affected.

Low severity. Can I keep driving?Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

Check engine lamp, also while driving warm
Secondary air tests not run
Other sensor codes if the shared 5 V line is affected

Most likely causes

Signal wire open or shorted to ground
5 V reference missing, often shared with other sensors
Pressure sensor failed internally

What to check, in order

Start with the simplest. You can tick off each step.

Listen for the pump running during a cold start
With the connector unplugged, check whether the signal wire is making contact with ground.
Check the fuse and relay
Inspect the hoses and valve for moisture or carbon
Run the actuator test with the scanner

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2432 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
4: Emissions
32: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2432?

Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

What causes code P2432?

The most common causes are: signal wire open or shorted to ground; 5 V reference missing, often shared with other sensors; pressure sensor failed internally.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.